Question

How many atoms of hydrogen are there in 1.7g of ammonia?

Answer 1

$$\begin{gathered} Noofmoles=\frac{Givenmassofthesubs\tan ceing}{Molarmass} \\ =\frac{1.7}{17}=0.1mol \\ Noofmolecules=Mole\times avogadronumber \\ =0.1\times 6.022\times {10}^{23} \\ =6.022\times {10}^{22}molecules \\ 1Moleculeofammoniacontain3atomsofhydrogen\left(N{H}_3\right) \\ 6.022\times {10}^{22}moleculescontain=\frac{3}{1}\times 6.022\times {10}^{22} \\ =18.066\times {10}^{22}atomsofhydrogen \end{gathered}$$